Introduction

The following improved orbital elements, are from 548 observations
1925 August 21 to 2014 February
28,
including full planetary and non-gravitational effect of type II,
and relativity effect of the sun.

The mean residual is 0.50 arc second.

Elements

Orbital elements given with respect to the mean ecliptic and equinox of J2000.
Epoch : 2011 December 29 at 0h TT, julian day 2455924.5.